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ozwebfx has a point..however you could still use the same concept with a blog like Word Press, which is free.

Make a category for each type of sweepstake, and then make a post for each one. Add a little info, and then paste the URL. Pretty much what that website gives you, but they probably have a CMS type system. If you don't like Word Press, then the same concept could be applied to other blog software as well. Not the best, but it can get the job done.